Qt app launched at startup of a Jetson Nano

steph27

Hi,

I made a Qt quick application (with Qt 5.15.2) that works well on a Jetson Card.
I now want to launch it automaticaly at startup, so I created a service to do that :

[Unit]
Description= Camera_quick autostart
After=graphical.target

[Service]
Type=simple
User=jetson
WorkingDirectory=/home/jetson/Startup/Camera_quick
ExecStart=/home/jetson/Startup/Camera_quick/Camera_quick

[Install]
WantedBy=multi-user.target

But this service is not able to run the app :

camera-quick.service - Camera_quick autostart
   Loaded: loaded (/lib/systemd/system/camera-quick.service; enabled; vendor preset: enabled)
   Active: failed (Result: core-dump) since Wed 2022-01-19 16:51:53 CET; 1min 18s ago
  Process: 7749 ExecStart=/home/jetson/Startup/Camera_quick/Camera_quick (code=dumped, signal=ABRT)
 Main PID: 7749 (code=dumped, signal=ABRT)

Jan 19 16:51:47 jetson systemd[1]: Started Camera_quick autostart.
Jan 19 16:51:52 jetson Camera_quick[7749]: qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
Jan 19 16:51:52 jetson Camera_quick[7749]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Jan 19 16:51:52 jetson Camera_quick[7749]: Available platform plugins are: xcb.
Jan 19 16:51:53 jetson systemd[1]: camera-quick.service: Main process exited, code=dumped, status=6/ABRT
Jan 19 16:51:53 jetson systemd[1]: camera-quick.service: Failed with result 'core-dump'.

However, when I run "/home/jetson/Startup/Camera_quick/Camera_quick", the app is launched (so the plugin "xcb" is found!).

To summarize :
- launched by Qt : works
- launched by terminal : works
- launched by service : doesn't work

Any ideas ?

Regards

jsulm

@steph27 You should search here for this topic.
There was one recently, with a solution.
I guess that your app is started before X server is. That means: your app should depend on X server.

steph27

Ok I should have missed it...

I tried to start the service directly to test it and it was through a remote desktop with VNC so the X server was running.
Moreover, the line

After=graphical.target

should wait for it no ?

steph27

Ok I changed the way of doing that :
I created a *.desktop file in .config/autostart

[Desktop Entry]
Path=/home/jetson/Startup/Camera_quick
Exec=/bin/bash /home/jetson/Startup/Camera_quick/run.sh
Type=Application

and the run.sh file is :

#!/bin/bash
export LD_LIBRARY_PATH=/usr/local/Qt-5.15.2/lib/
/home/jetson/Startup/Camera_quick/Camera_quick

And that works !
Thanks